Washing machine



United States Patent 3,481,162 WASHING MACHINE Edwin E. Ziegler,Lynnfield, Mass., assignor to General Electric Company, a corporation ofNew York Filed May 8, 1968, Ser. No. 727,437 Int. Cl. D061? 39/08, 31/00U.S. Cl. 68-4 12 Claims ABSTRACT OF THE DISCLOSURE A washing machineadapted to wash two loads of fabrics simultaneously in separatesolutions without liquid interchange therebetween includes a tub toreceive liquid and fabrics to be washed in the liquid and a generallyvertically disposed agitator in the tub for causing a washing action. Apump draws liquid in from the first tub, directs it up through theagitator and out at the top of the agitator for filtering. A second tubis mounted on the agitator for movement therewith and defines conduitsto return the recirculated liquid to the first tub. The machine alsoincludes means to fill both tubs without liquid interchange and toextract the liquid without interchange between the tubs. The machinealso includes means for expelling the liquid from both tubs to a commonchamher without liquid interrningling in either tub.

BACKGROUND OF THE INVENTION This invention relates to fabric washingmachines, and more particularly, to such a machine which is adapted toconcurrently wash two separate loads of fabrics without interminglingthe liquid used in the washing process.

One shortcoming of presently available fabric washing machines is thatthe user cannot concurrently wash items which are incompatible, forinstance white garments and colored garments, which may run, or fuzzygarments and other garments, which might pick up lint released from thefuzzy garments. Thus, for what should be an average wash load the usermay have to run two or more separate loads in order to wash all theitems, even though the total size of the load does not exceed thecapacity of the washing machine. Prior art patents which relate towashing machines for providing a concurrent but separate washingoperation propose systems for keeping the liquid separated which arevery complicated. Thus, such systems would substantially increase theinitial cost of the machine to the user and, because of their greatercomplexity, increase the possibility of malfunction.

An object of this invention is to provide a new and improved washingmachine for concurrently washing two loads of fabrics.

Another object of the present invention is to provide such an improvedmachine wherein the liquid for washing each load is maintained away fromthe other load.

SUMMARY OF THE INVENTION By one form of the present invention there isprovided a washing machine including means defining a chamber with afirst open top tub to receive liquid and fabrics to be washed in thatliquid mounted in the chamber. A movably mounted agitator extendsupwardly within the first tub to agitate the liquid and fabrics therein.The machine also includes a second, substantially imperforate, open toptub to receive liquid and fabrics to be washed in that liquid with thesecond tub being mounted on the agitator for movement therewith withinthe first tub. Recirculation pump means is eifective to draw liquid fromthe first tub inwardly at the lower portion of the agitator, direct itupwardly through the agitator and discharge it adjacent the upper end ofthe agitator. The second tub includes 3,481,162 Patented Dec. 2, 1969"ice vertical channels so that conduits are formed to return the liquidto the first tub separate from the second tub. Means is included fordirecting liquid from the second tub over the top of the first tub intothe chamber.

BRIEF DESCRIPTION OF THE DRAWINGS FIGURE 1 is a somewhat schematic sideelevational view of a clothes washing machine incorporating oneembodiment of the present invention, the view being partly broken awayand partly in section for illustration; and

FIGURE 2 is an enlarged, fragmentary view of a portion of the machine ofFIGURE 1, illustrating certain aspects of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring first to FIGURE 1,there is shown a cothes washing machine of the generally verticalagitator, spin tub type, incorporating one embodiment of the presentinvention. An outer appearance cabinet 1 is provided with a bottombulkhead 2, welded or otherwise secured within the casing to provide awater collection chamber 3 and a machinery compartment 4. Disposedwithin the latter compartment is a frame 5, mounted for gyratory movement about a pivot point (not shown) located in a transverse structuralmember at the base of the cabinet. The frame carries a drive motor 6disposed with its shaft projecting vertically downward. The shaft has adrive sheave and its end is attached to the rotor of a pump 7, whichreceives liquid from the chamber 3 by way of a screened inlet 8 in thebulkhead 2, the inlet being attached to the pump by an inlet hose 10. Adischarge hose 11 leads from the pump 7 for discharge of liquid from thewasher by some suitable means such as by the discharge hose hooking overthe side of the laundry tub to discharge the spent washing and rinsingliquid thereinto.

The motor 6 is of the reversible, split phase, induction type commonlyused in washing machines. As is well understood in the art, when themotor operates in one direction, it oscillates the agitator for washingand rinsing functions, and, when operated in the other direction, itrotates the clothes tub and agitator together for centrifugal extractionof liquid from the fabrics in the tub. The pump 7 may be of any of thewell known types so that, when the motor is operating in the spindirection, the pump removes water from the chamber 3; and, when themotor is operating in the wash direction, the pump is generallysubstantially less effective as a pumping mechanism.

A transmission 14 is mounted within the frame 5 and has a casing 15about the lower portion of which a circular, concentric skirt 16provides a driven clutch element. Within the skirt 16 there is auni-directional clutch 17 of a type well known in the art. The clutch isfixed to a sheave 18, from which a belt 20 connects with the motor shaftdrive sheave. When the motor operates in the spin direction the clutch17 engages the skirt 16 to rotate the housing 15 therewith. By means ofa conventional slip clutch 21 of the coil spring type, the rotation ofsheave 18 in a wash direction transmits torque to the transmission 14while clutch 17 disengages the skirt 16 so that drive torque is nottransmitted to the housing 15. It will be understood that anyconventional braking or snubbing device (not shown) may be used torestrain rotation or oscillation of the casing 15 during the washingoperation. During the spin operation, the clutch 21 slips relative tothe transmission 14, whereupon no torque is transmitted thereto. Detailsof construction of one suitable transmission of this generalconfiguration are illustrated and described in U.S. Patent No.3,l45,553McMillan, assigned to the General Electric Company, assignee ofthe present invention.

A sleeve 23 extends from the transmission and is secured to a fixture 24on which is mounted a liquid and fabric receiving receptacle or tub 25;so that, when the transmission housing is rotated as aforesaid, tub 25rotates therewith. A flexible rubber boot 26 is fixed to the sleeve 23and bulkhead 2 to prevent passage of liquid into the machinerycompartment while permitting gyratory movement of the sleeve 23 relativeto the bulkhead 2. A coil spring 27 is mounted between the frame and adamping device (not shown) on the underside of bulkhead 2 which servesto damp excessive gyrations, as is well known in the art.

Within the tub and coaxial therewith is an agitator 28. The agitatorincludes a relatively large center cost 30, from which extend aplurality of vanes 31, the vanes being arranged as spiral about the post30. The agitator is secured to the splined upper end 32 of an agitatorshaft 33, which extends downwardly through the agitator and through thesleeve 23 to the transmission 14. During wash and rinse steps, thetransmission 14 is effective to cause the shaft 33 to oscillate aboutits axis which, in turn, causes oscillation of the agitator. The shaft33 is disposed within a sleeve 34 which is connected at its upper end toa depending flange 35 formed on the interior of the agitator center post30. The lower end of sleeve 34 forms a portion of a pump structure 36,which is mounted on the agitator for movement therewith. A cap 37 isthreaded on the upper portion of this splined end 32 and holds theagitator assembly together during operation.

Thus, during agitation operations the agitator and pump oscillatetogether with the agitator shaft 33 about a generally vertical axis. Thevanes 31 cause relative motion of the fabrics and liquid in the tub 25to effect washing of fabrics. Liquid is drawn inwardly through openings38 in the lower portion of agitator 28 by the pump 36 and forcedupwardly through an annular passage 39, formed between the sleeve 34 andagitator center post 30. Appropriate openings 40 are formed adjacent thetop of the agitator for the recirculated liquid to flow outwardly fromthe agitator. Additional details of structure of the agitator shaft andpump arrangement and a more complete description in the manner ofoperation of a suitable pump of this type are found in theaforementioned McMillan Patent 3,145,553.

The tub 25 is generally frusto-conical in shape and is substantiallyimperforate, having only a row of exit openings or apertures 41, formedadjacent the top of the outer wall of the tub through which liquid isejected into the chamber 3 during spin or centrifugal extractionoperations of the tub. A ring 42 of heavy material is carried at the topof the tub 25, above the openings 41 to contribute a stabilizinginfluence during spin.

The tub 25 has an open top 44, generally defined by the ring of material42, through which fabrics may be loaded into and unloaded from the tub.To this end the top of the cabinet is provided with an aligned opening45, which selectively may be closed by means of a lid 46 which ismounted over the opening 45.

A second or inner, substantially imperforate, open top tub 47 is mountedwithin the tub 25 on the agitator 28. The tub 47 includes an inner wall48, a bottom wall 49 and an outer wall 50. A resilient grommet 51 ismounted to the inner side of the inner wall 48 and is provided withserrations 52 which interfit with similar serrations 53 on the agitatorpost 30. These interfitting serrations insure that the inner tub 47moves with the agitator both when the agitator oscillates for a washingaction and when it rotates with the outer tub 25 for centrifugal liquidextraction. The positioning of the serrations also is such that the topof the inner tub is above the top of the outer tub 25.

Around the circumference of the inner wall 48 there is provided a numberof channels such as that illustrated at 54. These channels serve anumber of purposes one of which is to help agitate the liquid andfabrics in the tub 47 to provide a washing action for such fabrics. Thechannels also provide recesses which fit about the vanes 31 of theagitator so that the tub 47 may fit closely around the agitator. Thus,while the channels are generally vertical, they may spiral or take onsuch other shape as is necessary to conform to the vanes.

As explained above, the pump 36 draws liquid inwardly from the tub 25 atthe lower portion of the agitator and pumps it upwardly through theagitator and then outwardly through holes 40. The channels 54 alsodefine conduits 55 which are spaced around the agitator and communicatewith the upper portion of the agitator adjacent the holes 40. Theconduits 55 form return paths for the liquid emitted from the holes 40so it may return to the tub 25 without going into the tub 47.

A perforated filter 56 is mounted inside the upper portion of the tub 47so as to rest on the grommet 51 and be in register with both theopenings 40 and the conduits 55. Thus, the liquid exiting from theopenings 40 fiows through the filter 56, which effectively filters outlint and other foreign matter from the liquid before it returns to thetub 25. The filter 56 includes a flange 57 which firmly engages theupper portion of the Wall 48 to prevent the liquid from flowing upwardlybetween the filter and the wall 48.

A ledge 58 projects inwardly from the upper portion of the outer wall 50and extends circumferentially around the wall 50. The ledge includes anumber of spaced openings 59, adjacent the wall 50, so that liquid mayexit from the tub 47 along wall 50 during centrifugal extraction.

A cover structure is removably mounted in the top of the tub 47 andincludes a first cover member 60. The cover member 60 has a firstportion 61 which extends inwardly from over the upper edge of the wall50 and joins a second portion 62 which extends downwardly adjacent theinner edge of the ledge 58. The second portion then joins a thirdportion 63 which extends inwardly in a generally horizontal directionbut slightly upwardly and terminates just inwardly of the upper edge ofthe inner wall 48. The wall portion 63 mounts in firm engagement withthe top of wall 48 to prevent liquid flow therebetween. The filter 56may, in fact, be attached to the radially inner edge of the wall portion63 so as to be removable therewith for ease of cleaning. The flange 57of the filter then serves as a means for helping to retain the cover onthe inner tub 47 by its engagement with the upper edge of inner wall 48.

A second cover member 64 is attached to the first cover member 60 andhas a first portion 65 which extends downwardly along and beyond theportion 62 of the first member. It then joins a second portion 66 whichextends radially inwardly in a generally horizontal manner, slightlyspaced from the portion 63. At its inner end, portion 66 joins anupwardly and inwardly extending third portion 67, which is joined to theportion 63. The first portion 65 of the second cover member is formedwith a number of spaced ribs 68 which extend outwardly from the portion65 so as to resiliently engage the inner edge of the ledge 58 as thecover is inserted in and removed from the tub 47. Thus the cover has asnap fit in the tub 47.

A number of radially extending ribs 69 project downwardly from the wallportion 61 of cover member 60 and engage the upper edge of the outer tubwall 50 so that the outer edge of the cover is slightly spaced from theupper edge of the tub 25. This provides exit openings in the form of agenerally continuous annulus around the upper periphery of the tub 47.These openings allow the liquid which is expelled through the holes 59during centrifugal extraction to flow out over the upper edge of thewall 50.

The wall portion 63 of cover member 60 is provided with a number ofcircumferentially spaced openings 70 around its radially outer perimeterand the wall portion 66 of cover member 64 is provided with a number ofcircumferentially spaced openings 71 around its radially innerperiphery. The openings 70 and 71 both communicate with the space 72,which is formed between the wall portions 63 and 66. Thus, liquid cominginto registry with the cover may enter the tube 47 through the openings70, space 72 and openings 71.

An inlet mechanism, generally indicated at 73, is provided to cooperatewith the cover to fill the tubs 47 and 25 with suitable liquid forwashing and rinsing fabrics in the machine. As is well known in the artthe water inlet mechanism may include a suitable solenoid operated valveassembly 74 which is adapted to be connected to sources of hot and coldwater (not shown) so that hot, cold or warm water selectively may beprovided to the machine by suitable actuation of the valve mechanism. Aninlet tube 75 is connected to the outlet of the valve mechanism andextends inwardly so as to project the stream of inlet water intoregistry with the cover 60.

It will be noted that the holes 70 and 71 and the space 72 in the coverare positioned so as to be above the openings 41 in the outer tub 25 andbelow the exit openings in the inner tube 47 provided by the holes 59and spacing of the cover from the upper edge of the inner tub by theribs 69. When the stream of inlet water is projected from the tube 75onto the cover 60, it initially will flow through the openings 70, space72 and openings 71 into the inner tube 47 until the level of liquid inthat tube rises to a sufiicient height to be even with and fill thespace 72. At this time no more liquid can enter the tub 47. The streamof liquid then is diverted and flows inwardly across the wall portion 63and over the inner edge of this wall portion. Thence it flows throughthe filter 56 and conduits 55 to fill the outer tub 25.

It will be recognized that, as thus far described, the machine will fillboth the inner and the outer tubs with washing and rinsing liquid,without any interchange of these liquids. It also will circulate andfilter the liquid in the outer tub, without any interchange with theliquid in the inner tub. It is also desirable during centrifugalextraction to prevent any mixing within the tubs of the liquid. Thiswill enable the user to wash a load of one type of items in one tub and,at the same time, another load of some other type of items in the othertub.

To this end a protective member 76 is mounted to eX- tend completelyaround the upper edge of the outer tub 25. This protective member isformed with a first wall 77 which extends inwardly from the upper edgeof the outer tub and is inclined slightly upwardly so as to form aflange extending around the upper edge of the tub 25. The outer edge ofthe protective member 76 is bent outwardly to form a similar flange 78which extends outwardly and downwardly from the outer bottom corner ofthe balance ring 42. The protective member 76 also includes a pluralityof vanes 79 spaced circumferentially around the upper surface of member76. These vanes extend generally radially outward across the top of tub25 and project upwardly therefrom. A wall 80 extends outwardly from theupper end of the wall 50 of the inner tub 47 below the openings for theinner tub provided by the spacing between the wall 50 and the cover 60.The wall 80 overlies the wall 77.

During centrifugal extraction both the outer tub 25 and inner tub 47 arerotating at high speed. With the arrangement of parts described theliquid in the outer tub 25 will move up its outer wall and flowoutwardly through the openings 41 into the chamber 3, from which it willbe pumped out of the machine through the screened inlet 8 to the pump 7.The liquid in the inner tub 47 will move upwardly along the wall 50,through the openings 59 then outwardly around the ribs 69 through thespacing between the upper edge of wall 50 and the cover 60. This liquidwill be directed generally radially outwardly over the protective member76 by the vanes 79 into the chamber 3, from which it also will beexhausted from the machine by pump 7. During the high speed operation ofthe basket the vanes 79 prevent any of the liquid expelled from theinner tub 47 from forming a rotating annulus around the wall 77 andpositively urge essentially all of this liquid over the top of the tub25.

During at least the first portion of each period of agitation, inner tub47 will be filled to the level of space 72. The oscillating of tub 47with agitator 28 may cause some of the liquid in tub 47 to be expelledthrough the openings between tub 47 and cover member 60. The overlappingof the walls 77 and prevents any of this liquid from the tub 47 fallinginto the tub 25. This liquid will run down wall 77, between the vanes 79and across the protective member 76. The flange 78 causes the liquidflowing across the protective member 76 to drop off the edge of theflange 78 into the chamber 3 and prevents it from flowing around theoutside of the tub 25 so as to enter that tub through the openings 41.

When tub 47 has been removed and the machine is being used in the moreconventional manner, the vanes 79 function as a clothes guard. That is,they prevent fabrics in the tub 25 being floated over the top of tub 25into chamber 3.

The particular controls for causing the machine to proceed through asuitable sequence of operation form no part of this invention and manysuch suitable controls are well known in the art. Therefore, noparticular control has been described. However, during a typical cycleof operation, fabrics are loaded in the tub 25 then the tub 47 isinserted around the agitator with the splines 53. Fabrics then areloaded into the inner tub 47 and the cover 60 is placed on the tub. Thelid 46 is closed and the machine started. First a stream of inlet waterof a temperature selected by the user flows through the valve assembly74 and is ejected from the tube 75 into registry with the cover 60. Atleast most of this liquid will flow through the openings 70, space 72and openings 71 into the inner tub 47, until the level of the liquid inthe inner tub rises sufiiciently to block off the space 72. Thereafterthe stream of inlet water is diverted and flows across the wall portion63, through the filter 56 and conduits 55 into the outer tub 25. Thisaction continues until a suitable water level is reached in the tub 25.

Thereafter the water supply is interrupted and the motor 6 is energizedto rotate in a direction to cause oscillation of the agitator 28 and tub47. The vanes 31 cause agitation of the liquid and fabrics in the outertub 25 while the channels 54 cause agitation of the liquid and fabricsin the inner tub 47. During this period of operation any liquid splashedfrom tub 47 flows down wall 77, between vanes 79, across member 76 anddrop oif flange 78 into chamber 3.

At the end of a suitable period of this agitation the motor is stoppedand then restarted in the reverse direction so that the transmissioncauses the agitator and outer tub 25 to rotate together at high speedwith the agitator carrying the inner tub 47 at high speed forcentrifugal extraction of liquid from both of the tubs. The liquid inthe outer tub flows outwardly through the openings 41 into the chamber 3while the liquid from the inner tub flows through the openings 59 andspace between the top of wall 50 and cover 60, between the vanes 79 intothe chamber 3. During this operation the pump 7 is operated to exhaustthe vitiated liquid from the chamber 3.

This sequence of operation is repeated the desired number of times;normally at least twice, the first sequence being conducted while thereis a suitable detergent in the tubs 25 and 47 to provide a washing step,while the second sequence is provided with clean water to give a rinsestep.

What is claimed as new and desired to be secured by Letters Patent ofthe United States is:

1. In a vertical axis washing machine;

(a) a first, open top tub to receive liquid and fabrics to be washed inthat liquid;

(b) a movably mounted agitator extending upwardly in said first tub;

(c) drive means for effecting a washing motion of said agitator;

(d) a second substantially imperforate, open top tub to receive liquidand fabrics to be washed in that liquid, said second tub being mountedon said agitator for movement therewith;

(e) recirculation pump means effective, during washing motion of saidagitator, to draw liquid from said first tub inwardly at the lowerportion of said agitator, direct it upwardly through said agitator anddischarge it adjacent the upper portion of said agitator;

(f) said second tub having generally vertically extending channelstherein adjacent said agitator; whereby conduits are formed to returnthe recirculated liquid from the upper portion of said agitator to saidfirst tub separate from said second tub.

2. The invention as set forth in claim 1 wherein said second tubincludes filter means positioned between the upper portion of saidagitator and said conduits for filtering the recirculated liquid.

3. The invention set forth in claim 1, further including liquid inletmeans positioned to direct a stream of liquid into said machine inregistry with the top of said second tub; a cover substantially closingthe top of said second tub; said cover including a first, generallyhorizontally extending wall portion having at least one radially outwardopening therein and a second, generally horizontally extending wallportion spaced slightly below said first Wall portion and having atleast one radially inward opening therein; said first wall portioncommunicating with said conduits, whereby the stream of liquid may entersaid second tub until the liquid therein rises substantially to thelevel of the space between said wall portions and thereafter the streamof liquid flows inwardly over said first wall portion to fill said firsttub through said conduits.

4. In a vertical axis washing machine;

(a) a first, substantially imperforate, open top tub to receive liquidand fabrics to be washed in that liquid; said tub defining a pluralityof openings below the top thereof for the exit of liquid therefrom;

(b) a movably mounted agitator extending upwardly in said first tub;

(c) drive means connected to said first tub and said agitator foreffecting a washing motion of said agitator and for rotating said firsttub and agitator together at high speed to centrifugally extract liquidfrom the fabrics;

(d) a second, substantially imperforate, open top tub to receive liquidand fabrics to be washed in that liquid, said second tub being mountedon said agitator for movement therewith within said first tub, with theupper portion of said second tub being above the openings in said firsttub;

(e) said second tub being provided with a plurality of exit openingspositioned for discharging liquid therefrom over the top of said firsttub during centrifugal extraction;

(f) recirculation pump means effective, during washing motion of saidagitator, to draw liquid in said first tub inwardly at the lower portionof said agitator, direct it upwardly through said agitator and dischargeit adjacent the upper portion of said agitator;

(g) said second tub having generally vertically extending channelstherein adjacent said agitator; whereby conduits are formed to returnthe recirculated liquid from the upper portion of said agitator to saidfirst tub separate from said second tub.

5. The invention as set forth in claim 4 wherein said second tubincludes filter means positioned between the upper portion of saidagitator and said conduits for filtering the recirculated liquid.

6. The invention as set forth in claim 4 wherein a first wall extendsinwardly from the upper portion of said first tub and is inclinedslightly upwardly and a second wall extends outwardly from said secondtub below the exit openings therein and overlies said first wall;thereby to prevent any of the liquid exiting from said second tub fromfalling into said first tub.

7. The invention as set forth in claim 6 wherein a plurality of spacedvanes project upwardly from the top of said first tub and extendradially of said first tub for guiding liquid expelled from said secondtub over the top of said first tub and preventing liquid expelled fromsaid second tub from forming a rotating annulus around the top of saidfirst tub during centrifugal extraction.

8. The invention as set forth in claim 4, further including liquid inletmeans positioned to direct a stream of liquid into said machine inregistry with the top of said second tub; a cover is provided tosubstantially close the top of said second tub; said cover including afirst, generally horizontally extending wall portion having at least oneradially outward opening therein and a second, generally horizontallyextending wall portion spaced slightly below said first wall portion andhaving at least one radially inward opening therein; said wall portionsbeing positioned above said exit openings in said first tub and belowsaid openings in said second tub; said first wall portion communicatingwith said conduits; whereby the stream of lquid may enter said secondtub until the liquid therein rises substantially to the level of thespace between said wall portions and thereafter the stream of liquidflows inwardly over said first wall portion to fill said first tubthrough said conduits.

9. In a vertical axis washing machine;

(a) means defining a chamber;

(b) a first, substantially imperforate, open top tub mounted in saidchamber to receive liquid and fabrics to be washed in that liquid;

(0) a movably mounted agitator extending upwardly in said first tub;

(d) a second, substantially imperforate, tub to receive liquid andfabrics to be washed in that liquid, said second tub being mounted onsaid agitator for movement therewith, with the upper portion of saidsecond tub being at least as high as the upper portion of said firsttub;

(c) drive means for effecting a washing motion of said agitator and forrotating said first tub and said agitator together for centrifugalextraction of liquid from the fabrics;

(f) means defining spaced openings adjacent the upper edge of saidsecond tub for exit of liquid therefrom during agitation and centrifugalextraction operations; and

(g) means associated with said first tub for guiding over the top ofsaid first tub into said chamber liquid discharged from said second tubduring agitation and centrifugal extraction.

10. The invention as set forth in claim 9, wherein a first wall extendsinwardly from the upper portion of said first tub and is inclinedslightly upwardly and a second wall extends outwardly from said secondtub below the exit openings therefor and overlies said first wall;thereby to prevent any of the liquid exiting from said second tub fromfalling into said first tub.

11. The invention as set forth in claim 9 wherein a plurality of spacedvanes project upwardly from the top of said first tub and extendradially of said first tub for guiding liquid expelled from said secondtub over the 9 10 top of said first tub and preventing liquid expelledfrom References Cited said second tub from forming a rotating annulusaround UNITED STATES PATENTS the top of said first tub duringcentrifugal extraction.

12. The invention as set forth in claim 9 wherein said fi fiffi t-Ifittbdfi ll'tf r1 bl tht rs 6 Des a P y 0 P gs 60W 6 P 5 3,324,6886/1967 Hubbard m. 68 4 thereof for the exit of liquid therefrom; and athird wall extending radially outwardly from said first tub above theopenings therein to prevent liquid expelled from said WILLIAM L PRICEPnmary Exammer second tub over the top of said first tub from enteringsaid U S Cl X R first tub through the openings therein. 10 23 4 27

